/**
 * Created by Administrator on 2018/4/25.
 */

/*
var jsono = [{ //测试数据
    "保质期临期预警(天)": "adventLifecycle",
    "商品标题": "title",
    "建议零售价": "defaultPrice",
    "高(cm)": "height",

},{ //测试数据
    "保质期临期预警(天)": "adventLifecycle",
    "商品标题": "title",
    "建议零售价": "defaultPrice",
    "高(cm)": "height",

}];*/



function saveAs(obj, fileName) {//当然可以自定义简单的下载文件实现方式
    var tmpa = document.createElement("a");
    tmpa.download = fileName || "下载";
    tmpa.href = URL.createObjectURL(obj); //绑定a标签
    tmpa.click(); //模拟点击实现下载
    setTimeout(function () { //延时释放
        URL.revokeObjectURL(obj); //用URL.revokeObjectURL()来释放这个object URL
    }, 100);
}


const wopts = { bookType: 'xlsx', bookSST: false, type: 'binary' };//这里的数据是用来定义导出的格式类型
// const wopts = { bookType: 'csv', bookSST: false, type: 'binary' };//ods格式
// const wopts = { bookType: 'ods', bookSST: false, type: 'binary' };//ods格式
// const wopts = { bookType: 'xlsb', bookSST: false, type: 'binary' };//xlsb格式
// const wopts = { bookType: 'fods', bookSST: false, type: 'binary' };//fods格式
// const wopts = { bookType: 'biff2', bookSST: false, type: 'binary' };//xls格式

function downloadExl(data,filename) {
    const wb = { SheetNames: ['Sheet1'], Sheets: {}, Props: {} };
    wb.Sheets['Sheet1'] = XLSX.utils.json_to_sheet(data);//通过json_to_sheet转成单页(Sheet)数据
    saveAs(new Blob([s2ab(XLSX.write(wb, wopts))], { type: "application/octet-stream" }), filename + '.' + (wopts.bookType=="biff2"?"xls":wopts.bookType));
}

function s2ab(s) {
    if (typeof ArrayBuffer !== 'undefined') {
        var buf = new ArrayBuffer(s.length);
        var view = new Uint8Array(buf);
        for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
        return buf;
    } else {
        var buf = new Array(s.length);
        for (var i = 0; i != s.length; ++i) buf[i] = s.charCodeAt(i) & 0xFF;
        return buf;
    }
}